Experimental device and method for jet grouting reinforcement of high polymer soft rock-soil body

Abstract

The invention belongs to the technical field of tunnel surrounding rock reinforcement and foundation reinforcement, and discloses a rotary jet grouting reinforcement experiment device and method for a high polymer soft rock-soil body. The rotary jet grouting reinforcement experiment device for the high polymer soft rock-soil body comprises a grouting pump box, a first connecting pipe, a second connecting pipe, a material box and an injection assembly, the grouting pump box is provided with a first grout cavity and a second grout cavity, the first grout cavity is used for storing first high polymer grout, and the second grout cavity is used for storing second high polymer grout; the first connecting pipe is connected with the first slurry pump; the second connecting pipe is connected with a second slurry pump; the material box is used for accommodating experimental rock soil; the injection assembly is connected with the first connecting pipe and the second connecting pipe and used for injecting the first high polymer slurry and the second high polymer slurry into the material box. According to the rotary jet grouting reinforcement experiment device for the high polymer soft rock-soil body, grouting reinforcement experiments can be carried out at different grouting angles, so that the grouting reinforcement experiment requirements of different grouting angles are met.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel surrounding rock reinforcement and foundation reinforcement, and in particular to an experimental device and method for polymer soft rock and soil body rotary jet grouting reinforcement. Background Art

[0002] Weak rock and soil are widely distributed in my country. Many tunnels and road projects need to be constructed in areas with weak rock and soil. This will inevitably lead to geological disasters such as large deformation of soft rock and foundation settlement, which seriously affect the safety of construction and operation. Due to the problem of "taking water but not grout" in soft rock and soil media, traditional cement-based grouting reinforcement methods are difficult to adapt to. New reinforcement methods represented by rotary jet grouting technology have shown better adaptability.

[0003] At present, the rotary jet grouting technology is used to grout the soft rock and soil, and the traditional cement-based grouting materials are mostly used. Although the traditional cement-based grouting materials can effectively reinforce the above-mentioned soft rock and soil, in complex geological environments such as water-rich and high-stress environments, the water instability of cement-based grouting materials and the brittle fracture of the reinforced stone bodies are still significant. At the same time, the current rotary jet grouting equipment is mostly directly constructed on-site, and there is a lack of grouting reinforcement experiments before construction. Therefore, it is impossible to test and evaluate the physical properties of the reinforced piles obtained. Summary of the invention

[0004] The purpose of the present invention is to provide a polymer soft rock and soil body rotary jet grouting reinforcement experimental device and method, which can carry out grouting reinforcement experiments at different grouting angles to meet the grouting reinforcement experimental requirements at different grouting angles.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The polymer soft rock and soil rotary jet grouting reinforcement experimental device includes:

[0007] A grouting pump box, wherein the grouting pump box has an independent first slurry chamber and a second slurry chamber, wherein the first slurry chamber is used to store a first polymer slurry, wherein a first slurry pump is disposed in the first slurry chamber, and wherein the second slurry chamber is used to store a second polymer slurry, wherein a second slurry pump is disposed in the second slurry chamber;

[0008] a first connecting pipe, the first connecting pipe being connected to the first slurry pump;

[0009] a second connecting pipe, the second connecting pipe being connected to the second slurry pump;

[0010] A material box, the material box is used to contain experimental rock and soil;

[0011] An injection assembly, the injection assembly is connected to the first connecting pipe and the second connecting pipe respectively, and the injection assembly is used to inject the first polymer slurry and the second polymer slurry into the material box;

[0012] The injection assembly has a horizontal grouting position and a vertical grouting position. When the injection assembly is located at the horizontal grouting position, the injection assembly is horizontally connected to the material box; when the injection assembly is located at the vertical grouting position, the injection assembly is vertically connected to the material box; the injection assembly can rotate between the horizontal grouting position and the vertical grouting position so that the injection assembly is connected to the material box at different angles.

[0013] Preferably, the injection assembly includes an injection head and a grouting pipe, the injection head having a first input port, a second input port and a grouting port, the first connecting pipe and the second connecting pipe are respectively connected to the first input port and the second input port, the grouting pipe is arranged between the grouting port and the material box, and the grouting pipe is detachably connected to the injection head.

[0014] Preferably, the polymer soft rock and soil rotary jet grouting reinforcement experimental device also includes an adjustment component, which includes a mounting arm, and the injection component is arranged on the mounting arm and can move along the length direction of the mounting arm to change the distance between the injection component and the material box.

[0015] Preferably, the adjustment assembly also includes a mounting frame and a driving member, a guide rail is arranged on the mounting arm along the length direction, the mounting frame is slidably arranged on the guide rail, the injection head is arranged on the mounting frame, the driving member is arranged on the mounting arm, and the driving member is used to drive the mounting frame to move on the mounting arm.

[0016] Preferably, a walking roller is provided on the mounting arm.

[0017] Preferably, the adjustment assembly further comprises a traveling frame, the mounting arm is arranged on the traveling frame, and the mounting arm can rotate on the traveling frame so that the injection assembly can rotate between the horizontal grouting position and the vertical grouting position.

[0018] Preferably, the injection assembly further comprises a rotary motor, and the rotary motor is used to drive the grouting pipe to rotate.

[0019] Preferably, the polymer soft rock and soil rotary jet grouting reinforcement experimental device also includes a recovery box, a first return pipe and a second return pipe, the first return pipe is arranged between the first connecting pipe and the recovery box, the second return pipe is arranged between the second connecting pipe and the recovery box, and valves are arranged on the first return pipe and the second return pipe; the recovery box is used to collect the first polymer slurry and the second polymer slurry remaining in the grouting pump box after the experiment is completed.

[0020] Preferably, the recovery box has an independent first residual material chamber and a second residual material chamber, the first reflux pipe is connected to the first residual material chamber, and the second reflux pipe is connected to the second residual material chamber.

[0021] The experimental method for strengthening soft polymer rock and soil by jet grouting includes the following steps:

[0022] S1. placing the experimental rock and soil into the material box at a preset burial depth, and then injecting the first polymer slurry and the second polymer slurry into the first slurry cavity and the second slurry cavity respectively;

[0023] S2, adjusting the injection assembly to a predetermined grouting position, starting the first slurry pump and the second slurry pump, and performing grouting into a preset borehole of the experimental rock and soil in the material box;

[0024] S3, after the grouting is completed, the first slurry pump and the second slurry pump are turned off, and then the test rock and soil are taken out after the first polymer slurry and the second polymer slurry to be injected solidify;

[0025] S4, adjusting the injection assembly to different positions according to experimental requirements, and repeating steps S1-S3;

[0026] S5. Conduct physical parameter tests on the experimental rock and soil obtained from multiple experiments.

[0027] The beneficial effects of the present invention are:

[0028] The polymer soft rock and soil rotary grouting reinforcement experimental device provided by the present invention has a grouting pump box with a first slurry chamber and a second slurry chamber, the first slurry chamber is used to store a first polymer slurry, and the second slurry chamber is used to store a second polymer slurry, and the first slurry pump in the first slurry chamber and the second slurry pump in the second slurry chamber are respectively connected to the injection assembly through a first connecting pipe and a second connecting pipe, and because the injection assembly is connected to the material box, the grouting pump box can inject the mixed polymer slurry into the material box, thereby meeting the experimental requirements of injecting mixed polymer materials into the experimental rock and soil; because the first slurry chamber and the second slurry chamber of the grouting pump box are independent of each other, Therefore, the two different slurries are stored separately and do not contact each other before being injected into the material box, thereby avoiding slurry failure caused by mixing and ensuring the grouting reinforcement effect on the experimental rock and soil to the greatest extent; since a material box is provided, in which the experimental rock and soil are placed, the reinforced experimental rock and soil in the material box can be recovered and its physical properties can be tested after the grouting is completed; since the injection assembly can rotate between the horizontal grouting position and the vertical grouting position, the injection assembly can grout into the material box at different angles, so grouting reinforcement experiments at different grouting angles can be carried out, thereby meeting the grouting reinforcement experiment requirements at different grouting angles.

[0029] By using the polymer soft rock and soil rotary jet grouting reinforcement experimental method, the first polymer slurry and the second polymer slurry are mixed and then injected into the experimental rock and soil in the material box, so as to carry out the grouting reinforcement experiment. Since the experimental rock and soil are placed in the material box, the reinforced experimental rock and soil in the material box can be recovered and its physical properties can be tested after the grouting is completed; since the injection component can be rotated between the horizontal grouting position and the vertical grouting position, the grouting position of the injection component can be adjusted and multiple grouting operations can be carried out to carry out grouting reinforcement experiments at different grouting angles, thereby meeting the grouting reinforcement experiment requirements at different grouting angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a polymer soft rock and soil rotary grouting reinforcement experimental device provided by a specific embodiment of the present invention;

[0031] Figure 2 It is an exploded view of the injection assembly and the adjustment assembly provided in a specific embodiment of the present invention.

[0032] In the figure:

[0033] 1- Grouting pump box;

[0034] 2- first connecting pipe;

[0035] 3- second connecting pipe;

[0036] 4-Material box;

[0037] 5-injection assembly; 51-injection head; 52-grouting pipe; 53-rotating motor;

[0038] 6-adjustment assembly; 61-mounting arm; 611-guide rail; 612-travel roller; 62-mounting frame; 63-driving member; 64-travel frame;

[0039] 7- Recycling bin;

[0040] 8- first reflux pipe;

[0041] 9- Second return pipe. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] like Figure 1 As shown, the present invention provides a polymer soft rock and soil rotary jet grouting reinforcement experimental device, which comprises a grouting pump box 1, a first connecting pipe 2, a second connecting pipe 3, a material box 4 and an injection assembly 5. The grouting pump box 1 has an independent first slurry chamber and a second slurry chamber. The first slurry chamber is used to store a first polymer slurry, and a first slurry pump is arranged in the first slurry chamber. The second slurry chamber is used to store a second polymer slurry, and a second slurry pump is arranged in the second slurry chamber. The first connecting pipe 2 is connected to the first slurry pump; the second connecting pipe 3 is connected to the second slurry pump; the material box 4 is used to accommodate experimental rock and soil; the injection assembly 5 is respectively connected to the first connecting pipe 2 and the second connecting pipe 3, and the injection assembly 5 is used to inject the first polymer slurry and the second polymer slurry into the material box 4. In this embodiment, since the grouting pump box 1 has a first slurry chamber and a second slurry chamber, the first slurry chamber is used to store the first polymer slurry, and the second slurry chamber is used to store the second polymer slurry, and the first slurry pump in the first slurry chamber and the second slurry pump in the second slurry chamber are respectively connected to the injection assembly 5 through the first connecting pipe 2 and the second connecting pipe 3, and since the injection assembly 5 is connected to the material box 4, the grouting pump box 1 can inject the mixed polymer slurry into the material box 4, thereby meeting the experimental requirements of injecting mixed polymer materials into the experimental rock and soil; since the first slurry chamber and the second slurry chamber of the grouting pump box 1 are independent of each other, the two different slurries are stored separately and independently before being injected into the material box 4, and do not contact each other, thereby avoiding the failure of the slurry caused by mixing, and ensuring the grouting reinforcement effect on the experimental rock and soil to the greatest extent; since the material box 4 is provided, the material box 4 contains experimental rock and soil, so after the grouting is completed, the reinforced experimental rock and soil in the material box 4 can be recovered and its physical properties can be tested. Specifically, the first polymer slurry and the second polymer slurry need to be stored separately before being mixed and injected into the experimental rock and soil. The first polymer slurry is a single-component modified polyurethane material, and the second polymer slurry is a two-component modified polyurethane material. The single-component modified polyurethane material and the two-component modified polyurethane material are mixed to form a polymer slurry. The polymer has the characteristics of low viscosity, good water stability and high toughness. Compared with traditional cement-based materials, the polymer material has greater structural strength and better reinforcement effect after being injected into weak rock and soil. The first slurry pump and the second slurry pump are both variable frequency pumps, which can respectively adjust the delivery flow and delivery pressure of the first polymer slurry and the second polymer slurry, thereby realizing the adjustment of the grouting pressure of the experimental rock and soil in the material box 4.

[0047] The injection assembly 5 has a horizontal grouting position and a vertical grouting position. When the injection assembly 5 is at the horizontal grouting position, the injection assembly 5 is horizontally connected to the material box 4; when the injection assembly 5 is at the vertical grouting position, the injection assembly 5 is vertically connected to the material box 4; the injection assembly 5 can rotate between the horizontal grouting position and the vertical grouting position, so that the injection assembly 5 is connected to the material box 4 at different angles. In this embodiment, since the injection assembly 5 can rotate between the horizontal grouting position and the vertical grouting position, the injection assembly 5 can grout the material box 4 at different angles, so that grouting reinforcement experiments with different grouting angles can be performed, thereby meeting the experimental requirements of grouting reinforcement with different grouting angles.

[0048] Furthermore, if Figure 1 and Figure 2 As shown, the injection assembly 5 includes an injection head 51 and a grouting pipe 52. The injection head 51 has a first input port, a second input port and a grouting port. The first connecting pipe 2 and the second connecting pipe 3 are connected to the first input port and the second input port respectively. The grouting pipe 52 is arranged between the grouting port and the material box 4. The grouting pipe 52 is detachably connected to the injection head 51. In this embodiment, the injection head 51 is a three-way pipe fitting. The first input port, the second input port and the grouting port of the injection head 51 are all provided with valves. The grouting pipe 52 is detachably connected to the grouting port of the injection head 51. The grouting pipe 52 is used to transport the polymer slurry mixed by the first polymer slurry and the second polymer slurry into the material box 4. Since the grouting pipe 52 is detachably connected to the injection head 51, it is convenient to remove the grouting pipe 52 for cleaning after the grouting reinforcement experiment is completed, thereby improving practicality.

[0049] Specifically, Figure 1 As shown, the polymer soft rock and soil rotary grouting reinforcement experimental device also includes an adjustment component 6, which includes a mounting arm 61. The injection component 5 is arranged on the mounting arm 61 and the injection component 5 can move along the length direction of the mounting arm 61 to change the distance between the injection component 5 and the material box 4. In this embodiment, the mounting arm 61 is arranged on one side of the material box 4, and the injection head 51 is arranged on the mounting arm 61 and the injection head 51 can move along the length direction of the mounting arm 61 to change the distance between the injection component 5 and the material box 4, so that the height of the grouting can be adjusted to meet the grouting requirements of different hole depths.

[0050] Specifically, Figure 2As shown, the adjustment assembly 6 also includes a mounting frame 62 and a driving member 63. A guide rail 611 is provided on the mounting arm 61 along the length direction. The mounting frame 62 is slidably provided on the guide rail 611. The injection head 51 is provided on the mounting frame 62. The driving member 63 is provided on the mounting arm 61. The driving member 63 is used to drive the mounting frame 62 to move on the mounting arm 61. In this embodiment, a guide rail 611 is provided on the mounting arm 61 along the length direction. The mounting frame 62 and the guide rail 611 are slidably matched. The driving member 63 is provided on the mounting arm 61. The driving member 63 can drive the mounting frame 62 to move along the guide rail 611. Specifically, the driving member 63 can be a hydraulic cylinder or a gas cylinder. As long as it is a device that can drive the mounting frame 62 to move in a straight line, it is not limited here.

[0051] Specifically, Figure 1 As shown, a walking roller 612 is provided on the mounting arm 61. In this embodiment, the mounting arm 61 is provided with a walking roller 612, and the walking roller 612 is installed at the end of the mounting arm 61 through a bearing; when the injection assembly 5 is located in the vertical grouting position, the mounting arm 61 is perpendicular to the ground. Since the walking roller 612 is provided, the staff can adjust the grouting position of the injection assembly 5 in the material box 4 by pushing the mounting arm 61 to meet the grouting requirements at different horizontal positions, thereby improving the practicality of the polymer soft rock and soil body rotary grouting reinforcement experimental device.

[0052] Specifically, Figure 1 As shown, the adjustment assembly 6 further includes a traveling frame 64, on which a mounting arm 61 is disposed. The mounting arm 61 can rotate on the traveling frame 64 so as to allow the injection assembly 5 to rotate between a horizontal grouting position and a vertical grouting position. In this embodiment, the mounting arm 61 is arranged on the walking frame 64. When the injection assembly is in the vertical grouting position, the mounting arm 61 is erected on the walking frame 64 through the walking roller 612, and the grouting pipe 52 grouts the material box 4 along the vertical direction. In order to ensure the stability of the mounting arm 61 in the vertical grouting position, a blocking frame is also placed on the walking frame 64 to prevent the mounting arm 61 from moving on the walking frame 64; when it is necessary to adjust the grouting angle of the injection assembly 5, the staff first removes the blocking frame, and then gradually flattens the mounting arm 61 with the walking roller 612 as the fulcrum until the length direction of the mounting arm 61 is parallel to the ground. At this time, the grouting pipe 52 grouts the material box 4 along the horizontal direction; it can be understood that if grouting needs to be performed at a certain angle between the horizontal grouting position and the vertical grouting position according to experimental requirements, the mounting arm 61 is rotated to this angle position and fixed with the blocking frame. By rotating the mounting arm 61 with the walking roller 612 as a fulcrum, the injection assembly 5 can be switched between different grouting positions. The operation is simple and meets the requirements of grouting reinforcement experiments at different grouting angles.

[0053] Specifically, Figure 2As shown, the injection assembly 5 also includes a rotary motor 53, which is used to drive the grouting pipe 52 to rotate. In this embodiment, the mounting frame 62 is provided with a rotary motor 53, and the grouting port of the injection head 51 is provided with an inner rotating shaft and an outer sleeve, the outer sleeve is fixed on the mounting frame 62, the inner rotating shaft is inserted into the outer sleeve and rotates with the outer sleeve through a bearing, the inner rotating shaft is connected to the grouting port of the injection head 51, a pulley is fixed on the outer circumference of the inner rotating shaft, and the rotary motor 53 drives the pulley to rotate through a belt; the grouting pipe 52 is detachably connected to the inner rotating shaft, so that the first polymer slurry and the second polymer slurry enter the injection head 51 and mix, and then flow into the grouting pipe 52 from the grouting port through the inner rotating shaft, and while grouting the experimental rock and soil in the material box 4, the grouting pipe 52 will rotate, thereby realizing rotary grouting.

[0054] Furthermore, if Figure 1 As shown, the polymer soft rock and soil rotary jet grouting reinforcement experimental device also includes a recovery box 7, a first return pipe 8 and a second return pipe 9. The first return pipe 8 is arranged between the first connecting pipe 2 and the recovery box 7, and the second return pipe 9 is arranged between the second connecting pipe 3 and the recovery box 7. Valves are arranged on the first return pipe 8 and the second return pipe 9; the recovery box 7 is used to collect the first polymer slurry and the second polymer slurry remaining in the grouting pump box 1 after the experiment is completed. In this embodiment, the first connecting pipe 2, the second connecting pipe 3, the first return pipe 8 and the second return pipe 9 are all hoses, which can cooperate with the injection assembly 5 to rotate between the horizontal grouting position and the vertical grouting position; the connection position of the first return pipe 8 and the first connecting pipe 2 is close to the first input port of the injection head 51, and a valve is provided at the end of the first return pipe 8 close to the first connecting pipe 2, and the connection position of the second return pipe 9 and the second connecting pipe 3 is close to the second input port of the injection head 51, and a valve is provided at the end of the second return pipe 9 close to the second connecting pipe 3; it can be understood that when the grouting reinforcement experiment is completed, the staff closes the valves at the first input port and the second input port of the injection head 51, and then opens the valves on the first return pipe 8 and the second return pipe 9, and starts the first slurry pump and the second slurry pump, so as to recover the remaining slurry in the grouting pump box 1 and the first connecting pipe 2 and the second connecting pipe 3 into the recovery box 7, so as to facilitate the cleaning of the grouting pump box 1, the first connecting pipe 2 and the second connecting pipe 3.

[0055] Specifically, the recovery box 7 has an independent first residual material chamber and a second residual material chamber, the first reflux pipe 8 is connected to the first residual material chamber, and the second reflux pipe 9 is connected to the second residual material chamber. The recovery box 7 and the grouting pump box 1 are provided with independent first and second residual material chambers, the first residual material chamber is used to collect the first polymer slurry, and the second residual material chamber is used to collect the second polymer slurry; therefore, the two different slurries are stored separately in the recovery box 7 and do not contact each other, avoiding the slurry failure caused by mixing, and can continue to be used for the next grouting reinforcement experiment, thereby reducing the experimental cost.

[0056] This embodiment also provides a polymer soft rock and soil body rotary grouting reinforcement experimental method, using the polymer soft rock and soil body rotary grouting reinforcement experimental device, including the following steps:

[0057] S1. Put the experimental rock and soil into the material box 4 according to the preset burial depth, and then inject the first polymer slurry and the second polymer slurry into the first slurry cavity and the second slurry cavity respectively. In this embodiment, the staff fills the experimental rock and soil into the material box 4 according to the burial depth requirements of the experimental design, and then injects the first polymer slurry and the second polymer slurry into the first slurry cavity and the second slurry cavity of the grouting pump box 1 respectively.

[0058] S2, adjusting the injection assembly 5 to the predetermined grouting position, starting the first slurry pump and the second slurry pump, and grouting is performed into the preset borehole of the experimental rock and soil in the material box 4. In this embodiment, the injection assembly 5 is adjusted between the horizontal grouting position and the vertical grouting position, including the horizontal grouting position and the vertical grouting position, to achieve a predetermined grouting angle; then starting the first slurry pump and the second slurry pump, so as to perform grouting into the preset borehole in the experimental rock and soil in the material box 4.

[0059] S3. After the grouting is completed, the first slurry pump and the second slurry pump are turned off, and then the first polymer slurry and the second polymer slurry to be injected are solidified, and then the experimental rock and soil are taken out. In this embodiment, after injecting a specified amount of polymer slurry into the experimental rock and soil, the staff turns off the first slurry pump and the second slurry pump; and after waiting for the polymer slurry to solidify, the reinforced experimental rock and soil is taken out from the material box 4, so as to facilitate the subsequent physical parameter test.

[0060] S4. Adjust the injection assembly 5 to different grouting positions according to the experimental requirements, and repeat steps S1-S3. In this embodiment, the staff adjusts the grouting position of the injection assembly 5 according to the experimental design requirements to achieve a grouting angle different from that of the previous grouting reinforcement experiment, and then repeats steps S1-S3; at the same time, the staff can also adjust the delivery flow and delivery pressure of the first slurry pump and the second slurry pump according to the experimental design requirements to meet different experimental design requirements.

[0061] S5. Conduct physical parameter tests on the experimental rock and soil obtained from multiple experiments. In this embodiment, the staff conducts physical parameter tests on the reinforced experimental rock and soil obtained from multiple grouting reinforcement experiments, so as to obtain the reinforcement effect of the experimental rock and soil under different grouting conditions. The polymer soft rock and soil rotary grouting reinforcement experimental device is also provided with a first return pipe 8, a second return pipe 9 and a recovery box 7. The injection assembly 5 includes an injection head 51 and a grouting pipe 52. The injection head 51 is a three-way pipe fitting. Valves are provided at the first input port, the second input port and the grouting port of the injection head 51. The first connecting pipe 2 and the second connecting pipe 3 are respectively connected to the first input port and the second input port. The grouting pipe 52 is detachably connected to the grouting port of the injection head 51; the first return pipe 8 is arranged between the first connecting pipe 2 and the recovery box 7, and the second return pipe 9 is arranged between the second connecting pipe 3 and the recovery box 7; the connection position of the first return pipe 8 and the first connecting pipe 2 is close to the first input port of the injection head 51. A valve is provided on the first return pipe 8 at the end near the first connecting pipe 2, the connection position between the second return pipe 9 and the second connecting pipe 3 is close to the second input port of the injection head 51, and a valve is provided on the second return pipe 9 at the end near the second connecting pipe 3; it can be understood that when all the experiments are completed, the staff closes the valves at the first input port and the second input port of the injection head 51, and then opens the valves on the first return pipe 8 and the second return pipe 9, and starts the first slurry pump and the second slurry pump, so as to recover the remaining slurry in the grouting pump box 1 and the first connecting pipe 2 and the second connecting pipe 3 into the recovery box 7, so as to facilitate the cleaning of the grouting pump box 1, the first connecting pipe 2 and the second connecting pipe 3.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Experimental device for strengthening soft rock and soil with polymer jet grouting, characterized in that: include: A grouting pump box (1), the grouting pump box (1) having an independent first slurry chamber and a second slurry chamber, the first slurry chamber being used to store a first polymer slurry, a first slurry pump being arranged in the first slurry chamber, the second slurry chamber being used to store a second polymer slurry, a second slurry pump being arranged in the second slurry chamber; A first connecting pipe (2), the first connecting pipe (2) being connected to the first slurry pump; A second connecting pipe (3), wherein the second connecting pipe (3) is connected to the second slurry pump; A material box (4), wherein the material box (4) is used to contain experimental rock and soil; an injection assembly (5), the injection assembly (5) being connected to the first connecting pipe (2) and the second connecting pipe (3) respectively, and the injection assembly (5) being used to inject the first polymer slurry and the second polymer slurry into the material box (4); The injection assembly (5) has a horizontal grouting position and a vertical grouting position. When the injection assembly (5) is located at the horizontal grouting position, the injection assembly (5) is horizontally connected to the material box (4); when the injection assembly (5) is located at the vertical grouting position, the injection assembly (5) is vertically connected to the material box (4); the injection assembly (5) can be rotated between the horizontal grouting position and the vertical grouting position so that the injection assembly (5) is connected to the material box (4) at different angles.

2. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 1 is characterized in that: The injection assembly (5) comprises an injection head (51) and a grouting pipe (52); the injection head (51) has a first input port, a second input port and a grouting port; the first connecting pipe (2) and the second connecting pipe (3) are respectively connected to the first input port and the second input port; the grouting pipe (52) is arranged between the grouting port and the material box (4); and the grouting pipe (52) is detachably connected to the injection head (51).

3. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 2 is characterized in that: The polymer soft rock and soil rotary jet grouting reinforcement experimental device also includes an adjustment component (6), the adjustment component (6) includes a mounting arm (61), the injection component (5) is arranged on the mounting arm (61), and the injection component (5) can move along the length direction of the mounting arm (61) to change the distance between the injection component (5) and the material box (4).

4. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 3 is characterized in that: The adjustment assembly (6) further comprises a mounting frame (62) and a driving member (63); a guide rail (611) is arranged on the mounting arm (61) along the length direction; the mounting frame (62) is slidably arranged on the guide rail (611); the injection head (51) is arranged on the mounting frame (62); the driving member (63) is arranged on the mounting arm (61); and the driving member (63) is used to drive the mounting frame (62) to move on the mounting arm (61).

5. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 4 is characterized in that: The mounting arm (61) is provided with a walking roller (612).

6. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 3 is characterized in that: The adjustment assembly (6) further comprises a traveling frame (64), the mounting arm (61) being arranged on the traveling frame (64), and the mounting arm (61) being capable of rotating on the traveling frame (64) so ​​as to enable the injection assembly (5) to rotate between the horizontal grouting position and the vertical grouting position.

7. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 2 is characterized in that: The injection assembly (5) further comprises a rotating motor (53), and the rotating motor (53) is used to drive the grouting pipe (52) to rotate.

8. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 1 is characterized in that: The polymer soft rock and soil rotary grouting reinforcement experimental device also includes a recovery box (7), a first return pipe (8) and a second return pipe (9), wherein the first return pipe (8) is arranged between the first connecting pipe (2) and the recovery box (7), and the second return pipe (9) is arranged between the second connecting pipe (3) and the recovery box (7), and valves are arranged on the first return pipe (8) and the second return pipe (9); the recovery box (7) is used to collect the first polymer slurry and the second polymer slurry remaining in the grouting pump box (1) after the experiment is completed.

9. The polymer soft rock and soil rotary grouting reinforcement experimental device according to claim 8 is characterized in that: The recovery box (7) has an independent first residual material chamber and a second residual material chamber, the first reflux pipe (8) is connected to the first residual material chamber, and the second reflux pipe (9) is connected to the second residual material chamber.

10. Experimental method for strengthening soft rock and soil with polymer jet grouting, characterized in that: The polymer soft rock and soil rotary grouting reinforcement experimental device as described in any one of claims 1 to 9 comprises the following steps: S1, placing the experimental rock and soil into the material box (4) according to a preset burial depth, and then injecting the first polymer slurry and the second polymer slurry into the first slurry cavity and the second slurry cavity respectively; S2, adjusting the injection assembly (5) to a predetermined grouting position, starting the first slurry pump and the second slurry pump, and performing grouting into a preset borehole of the experimental rock and soil in the material box (4); S3, after the grouting is completed, the first slurry pump and the second slurry pump are turned off, and then the test rock and soil are taken out after the first polymer slurry and the second polymer slurry to be injected solidify; S4, adjusting the injection assembly (5) to different positions according to experimental requirements, and repeating steps S1-S3; S5. Conduct physical parameter tests on the experimental rock and soil obtained from multiple experiments.

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